kjs/DateMath.h

   1 /*
   2  * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
   4  *
   5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   6  *
   7  * The contents of this file are subject to the Mozilla Public License Version
   8  * 1.1 (the "License"); you may not use this file except in compliance with
   9  * the License. You may obtain a copy of the License at
  10  * http://www.mozilla.org/MPL/
  11  *
  12  * Software distributed under the License is distributed on an "AS IS" basis,
  13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  14  * for the specific language governing rights and limitations under the
  15  * License.
  16  *
  17  * The Original Code is Mozilla Communicator client code, released
  18  * March 31, 1998.
  19  *
  20  * The Initial Developer of the Original Code is
  21  * Netscape Communications Corporation.
  22  * Portions created by the Initial Developer are Copyright (C) 1998
  23  * the Initial Developer. All Rights Reserved.
  24  *
  25  * Contributor(s):
  26  *
  27  * Alternatively, the contents of this file may be used under the terms of
  28  * either of the GNU General Public License Version 2 or later (the "GPL"),
  29  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  30  * in which case the provisions of the GPL or the LGPL are applicable instead
  31  * of those above. If you wish to allow use of your version of this file only
  32  * under the terms of either the GPL or the LGPL, and not to allow others to
  33  * use your version of this file under the terms of the MPL, indicate your
  34  * decision by deleting the provisions above and replace them with the notice
  35  * and other provisions required by the GPL or the LGPL. If you do not delete
  36  * the provisions above, a recipient may use your version of this file under
  37  * the terms of any one of the MPL, the GPL or the LGPL.
  38  *
  39  */
  40
  41 #ifndef DateMath_h
  42 #define DateMath_h
  43
  44 #include <time.h>
  45 #include <string.h>
  46 #include <wtf/Noncopyable.h>
  47
  48 namespace KJS {
  49
  50 struct GregorianDateTime;
  51
  52 void msToGregorianDateTime(double, bool outputIsUTC, GregorianDateTime&);
  53 double gregorianDateTimeToMS(const GregorianDateTime&, double, bool inputIsUTC);
  54 double getUTCOffset();
  55 int equivalentYearForDST(int year);
  56 double getCurrentUTCTime();
  57
  58 const char * const weekdayName[7] = { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" };
  59 const char * const monthName[12] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
  60
  61 const double hoursPerDay = 24.0;
  62 const double minutesPerHour = 60.0;
  63 const double secondsPerHour = 60.0 * 60.0;
  64 const double secondsPerMinute = 60.0;
  65 const double msPerSecond = 1000.0;
  66 const double msPerMinute = 60.0 * 1000.0;
  67 const double msPerHour = 60.0 * 60.0 * 1000.0;
  68 const double msPerDay = 24.0 * 60.0 * 60.0 * 1000.0;
  69
  70 // Intentionally overridding the default tm of the system
  71 // Tee members of tm differ on various operating systems.
  72 struct GregorianDateTime : Noncopyable {
  73     GregorianDateTime()
  74         : second(0)
  75         , minute(0)
  76         , hour(0)
  77         , weekDay(0)
  78         , monthDay(0)
  79         , yearDay(0)
  80         , month(0)
  81         , year(0)
  82         , isDST(0)
  83         , utcOffset(0)
  84         , timeZone(0)
  85     {
  86     }
  87
  88     ~GregorianDateTime()
  89     {
  90         delete [] timeZone;
  91     }
  92
  93     GregorianDateTime(const tm& inTm)
  94         : second(inTm.tm_sec)
  95         , minute(inTm.tm_min)
  96         , hour(inTm.tm_hour)
  97         , weekDay(inTm.tm_wday)
  98         , monthDay(inTm.tm_mday)
  99         , yearDay(inTm.tm_yday)
 100         , month(inTm.tm_mon)
 101         , year(inTm.tm_year)
 102         , isDST(inTm.tm_isdst)
 103     {
 104 #if !PLATFORM(WIN_OS) && !PLATFORM(SOLARIS)
 105         utcOffset = static_cast<int>(inTm.tm_gmtoff);
 106
 107         int inZoneSize = strlen(inTm.tm_zone) + 1;
 108         timeZone = new char[inZoneSize];
 109         strncpy(timeZone, inTm.tm_zone, inZoneSize);
 110 #else
 111         utcOffset = static_cast<int>(getUTCOffset() / msPerSecond + (isDST ? secondsPerHour : 0));
 112         timeZone = 0;
 113 #endif
 114     }
 115
 116     operator tm() const
 117     {
 118         tm ret;
 119         memset(&ret, 0, sizeof(ret));
 120
 121         ret.tm_sec   =  second;
 122         ret.tm_min   =  minute;
 123         ret.tm_hour  =  hour;
 124         ret.tm_wday  =  weekDay;
 125         ret.tm_mday  =  monthDay;
 126         ret.tm_yday  =  yearDay;
 127         ret.tm_mon   =  month;
 128         ret.tm_year  =  year;
 129         ret.tm_isdst =  isDST;
 130
 131 #if !PLATFORM(WIN_OS) && !PLATFORM(SOLARIS)
 132         ret.tm_gmtoff = static_cast<long>(utcOffset);
 133         ret.tm_zone = timeZone;
 134 #endif
 135
 136         return ret;
 137     }
 138
 139     int second;
 140     int minute;
 141     int hour;
 142     int weekDay;
 143     int monthDay;
 144     int yearDay;
 145     int month;
 146     int year;
 147     int isDST;
 148     int utcOffset;
 149     char* timeZone;
 150 };
 151
 152 }   //namespace KJS
 153
 154 #endif // DateMath_h